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Chapter 4 - Chapter 4 Cells The Working Units of Life I...

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Chapter 4: Cells: The Working Units of Life I. Cell Theory a. All cells come form preexisting cells b. All organisms are made up of cells c. Cells are basic units of life II. Cell Size a. Small cells limited by surface area:volume b. Both increase as cell gets bigger, but SA slower c. Volume i. Amount of chemical reactions and time it takes d. Surface Area i. Amount of chemical reactions can fit based on # take in and # release III. Plasma Membrane a. Phospholipid bilayer i. Maintain internal homeostasis ii. Selective permeability iii. Cell-cell communication iv. Cell-cell binding IV.Prokaryotes a. Types i. Archaea ii. Bacteria b. Properties i. No membrane bound organelles ii. Live in extreme environments iii. Very small iv. Plasma membrane v. Nucleoid – holds DNA vi. Cytoplasm 1. Cyotosol – water, ions, soluble macromolecules, small molecules 2. Ribosomes – RNA; sites of protein synthesis vii.Cell Wall 1. Peptidoglycan (bacteria) viii. Capsule (bacteria) 1. Slime layer outside cell wall 2.
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